904B Wheel Loader Power Train Caterpillar

The following tables are provided in order to record information as you perform the tests on the machine. Make copies of these tables so that the tables may be used multiple times.

Table 1

Model Of The Machine		Date
Serial Number		Service Meter Hours
Engine Serial Number		Arrangement Number

Table 2

Test A Test for the Baseline
Test	Low Idle		High Idle
	Spec	Actual	Spec	Actual
Engine Speed	975 ± 50 rpm		2630 ± 50 rpm
Charge Pressure	3200 ± 300 kPa (464 ± 44 psi)		3660 ± 300 kPa (530 ± 44 psi)
Pump Signal Pressure	530 ± 150 kPa (77 ± 22 psi)		2050 ± 150 kPa (298 ± 22 psi)
Steering Pump Pressure	970 ± 300 kPa (141 ± 44 psi)		2140 ± 400 kPa (310 ± 58 psi)
Pressure for the Pump Case	60 kPa (9 psi) maximum		120 kPa (17 psi) maximum

Table 3

Test B for a Machine in a FORWARD or REVERSE Direction (Tortoise Mode)
Test	Spec	Actual
Signal Pressure	2400 ± 350 kPa (348 ± 50 psi)
AB Pressure for the Drive Loop	5700 ± 1500 kPa (828 ± 218 psi)
Engine rpm	2600 ± 75 rpm
Drive shaft rpm	1030 ± 50 rpm

Table 4

Test C for a Machine in a FORWARD or REVERSE Direction (Rabbit Mode)
Test	Spec	Actual
Signal Pressure	2340 ± 360 kPa (340 ± 52 psi)
AB Pressure for the Drive Loop	11000 ± 2000 kPa (1595 ± 290 psi)
Engine rpm	2560 ± 100 rpm
Drive shaft rpm	2850 ± 90